As you have identified, comparing a brand new car with one a few years old is not really a comparison. However, does the "extra" 80% seem worth it to be in a brand new car? For me, probably not. For others then it would mean a lot. Some people have never owned a car from brand spanking new, and to do so would be special. Others are happy to buy a few years old and just get a well looked after example and save the money.
For me, I seem to have recently taken to getting ex demo cars. The dealers often make next to no margin on an ex demo car and often its just a case of shifting it quickly to make room for the next demo car they have already ordered. With the money saved over list price, get it booked in for a full valet, even of the dealership has already cleaned it - and it feels like a brand new car - as you are the second owner after the dealership, for me its as close as you can get to brand new, without actually buying brand new.
Financially we would all be better off riding scooters or having an old fiat tipo to drive round in, but wheres the fun in that. As long as you dont do something really daft like remortgage your home to buy a set of wheels, then as long as you are happy with what you drive and what it costs you, then you cant say fairer than that.